CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

Particle Tracking Procedure

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   May 24, 2007, 11:58
Default Particle Tracking Procedure
  #1
T-student
Guest
 
Posts: n/a
Hi, I'm still new at fluent, I did a 3-d simulation of water coming into a tank and then going out, I animated my results, checked the velocity vectors, and everything looks fine... I ran the simulation for 15 seconds (until it reached steady state) and wanted to inject some particles and track them to see how they are deposited into the tank. I tried to do some tutorials but they don't really explain how to do that. Can anybody tell me if the steps that i'm following are correct? 1- set my discrete phase model. 2- set Models>Species>Transport & Reaction 3- set injections 4- run the iteration

after I run the simulation, I tried Display>particle tracks and all i can see the the geometry of the tank... I don't see the particles..

Any help would be appreciated.. Thanks
  Reply With Quote

Old   May 24, 2007, 12:22
Default Re: Particle Tracking Procedure
  #2
Adriano
Guest
 
Posts: n/a
Particle tracking works only with a discrete phase model end not with a transport&reaction model....

try to read User guide manual before performing tutorials and simulations...

A

  Reply With Quote

Old   May 24, 2007, 13:04
Default Re: Particle Tracking Procedure
  #3
Allan Walsh
Guest
 
Posts: n/a
When you use Display>particle tracks, do you see your injections listed on the panel? Have you selected them?

If so, in the particle track panel, choose report and then step-by-step. Select just the first particle (track single particle stream) and then select track.

What are the co-ordinates and velocities at the initial time step? Is it in the domain? Where you initially set it? Is it flowing into the domain? or out? What are doing with species and reactions? Are the particles changing mass? diameter? If so, what happens with time?

Good luck.
  Reply With Quote

Old   May 24, 2007, 14:52
Default Re: Particle Tracking Procedure
  #4
T-student
Guest
 
Posts: n/a
just to give you an idea of my model, it's a 2-d rectangular box, on the left wall, there is a small opening in the middle which is the inlet and on the left wall, there is a small opening on the bottom which is the outlet...

I selected the injection-0 that I created and when I select the report and then just the single particle stream, I select track and I can see the mass , time but without any numbers. It's like the data is not there. here's my injection parameters: 1- coordinates: I selected the injection of the particles 0.01 m inside the tank (next to the inlet), so yes, it is in the domain 2- initial velocity is 0.01 m/s (in my case just in the x-direction)

forget about the species and reactions, I didn't use it since the particles are not changing mass or diameter..

what do you suggest?

I really appreciate your help
  Reply With Quote

Old   May 24, 2007, 15:05
Default Re: Particle Tracking Procedure
  #5
Prasad Dudhgaonkar
Guest
 
Posts: n/a
You can inject a single inert particle stream. You should decide which material to use. The density of the material will have a significant influence over the the trajectory. Interaction between continuous phase and discrete phase should be activated. Set the duration of injection carefully.

If you need to just see how a fluid packet at the desired location (in front of inlet) travels with time then you can use Display-Path line.
  Reply With Quote

Old   May 24, 2007, 15:57
Default Re: Particle Tracking Procedure
  #6
T-student
Guest
 
Posts: n/a
I already chose a material from the fluent database and the interaction between continuous phase and discrete phase is already activated. the duration of injection is over 1 second (starting after 15 seconds of flow).

I'm interested in seeing how the flow travels starting from the front of inlet but the pathlines alone can not help because they don't take account of density.

  Reply With Quote

Old   May 25, 2007, 16:18
Default Re: Particle Tracking Procedure
  #7
Allan Walsh
Guest
 
Posts: n/a
Maybe you can look at the time again - I have to admit in working with Fluent for almost 20 years and hundreds of cases with particles, I have only run steady-state cases.

You say you ran the fluid flow calcs. for 15 sec. and the particles were only released for 1 sec. of that? Is there some disconnect there?

  Reply With Quote

Old   May 29, 2007, 14:10
Default Re: Particle Tracking Procedure
  #8
T-student
Guest
 
Posts: n/a
Allan, I ran the simulation for 15 seconds until it reached steady state, and after that, I stoped the iteration, and then injected the particles. Am I doing it wrong? If yes, what should be the procedure?

thx
  Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Blood Damage Modelling via Particle Tracking in a Centrifugal Heart Pump scatman CFX 5 May 5, 2011 07:23
massless particle tracking problem Renold FLUENT 0 January 26, 2011 15:23
Particle Tracking for ion Jun CFX 2 August 31, 2010 08:19
Number density tracking rather than particle tracking Rebecca Main CFD Forum 2 April 23, 2009 12:52
DPM UDF particle position using the macro P_POS(p)[i] dm2747 FLUENT 0 April 17, 2009 01:29


All times are GMT -4. The time now is 10:30.